Observatory · observe first

Follow the allocation change

Matched S&P 500 members → sector → industry → sub-industry → company. Each step uses the same percentage points.

Historical time machine
Historical observation
20182026
Universe›Materials›Steel›Steel

1 · Sector

Weight and 12M allocation change

Information Technology39.6%+4.74 ppConsumer Discretionary12.3%+1.05 ppUtilities2.7%-0.15 ppFinancials11.2%-0.18 ppIndustrials9.5%-0.27 ppEnergy2.2%-0.34 ppCommunication Services2.1%-0.37 ppReal Estate2.1%-0.48 ppMaterials2.0%-0.52 ppConsumer Staples5.9%-1.08 ppHealth Care10.5%-2.40 pp

2 · Industry

Inside Materials

Industrial Gases0.49%-0.18 ppSpecialty Chemicals0.44%-0.16 ppPaper & Plastic Packaging Products & Materials0.32%-0.07 ppGold0.17%+0.05 ppCommodity Chemicals0.03%-0.05 ppCopper0.12%-0.03 ppFertilizers & Agricultural Chemicals0.13%-0.03 ppConstruction Materials0.15%-0.02 ppMetal, Glass & Plastic Containers0.03%-0.02 ppSteel0.11%-0.01 pp

3 · Sub-industry

Inside Steel

Steel0.11%-0.014 pp
Concentrated

Most of this industry's losses came from a few companies.

View all contributions →
Steel · weight
0.11%
Industry change · 12M
-0.01 pp
Steel · contribution
-0.014 pp
Company participation
100%
of industry constituents above their 6M weight average

4 · Companies driving this sub-industry

Oct 2025 · sorted by absolute contribution to 12-month change

CompanyCountryMarket capUniverse weight3M contribution12M contribution12M price returnAbove 6M weight average
Nucor →
NUE
United States$34.4bn0.067%-0.002 pp-0.012 pp+7.7%Yes
Steel Dynamics →
STLD
United States$22.9bn0.045%+0.005 pp-0.002 pp+22.0%Yes

Company contributions use weights among matched S&P 500 members and add through each level without rescaling. Companies without matched shares and prices are omitted. These observations do not establish official index weights or actual fund flows.